Piston ring



ec. I 6, 927.

C. H. LEMERY PISTON RING Filed Jan. 20. 1,927'

lPatawa Dec. e, 1927.

CHABLES H, LEMERY, F SACBAMEN'I'O, CALIFORNIA.

rs'roN ame.

. .Application filed January 20, 1927. Serial No. 162,349.

- The type of piston ring in common use at the present time upon internal combustion engines, is such that on each compression stroke of the piston, the condensed fuel film, and the film of oil and dust on thecylinder wall, are forced into and collected in the,

space which exists above the first or upper ring and between the cylinder wall and the piston, and as the piston .advances `to compress the gases, the liquid and dust are Vforced i ployed elsewhere also if desired.

through the clearance of the piston ring and the upper side of the ring groove, into the clearance behind the ring, and this matter eventually finds its way into the 'crank case,`

often 'giving troubles with regard to lubrication. Moreover, this condition is the cause of excessive wear of the upper rings and grooves of pistons, the top ring of leach pis- 'ton being worn the most, the lsecond ring showing only about half of the side clearance as the top ring, and the third or fourth rings showing practically no wear after a perod of use equivalent to ten thousand miles operation of an automobile.

It is the object of `my invention to overcome the difliculty above pointed out, by the provision of a new and improved ring of such form as to remove the condensed fuel film together with -any accumulated oil and dust that have been deposited upon the cylinder wall during the suction and compression strokes, the ring serving to direct this material toward the center of the cylinder during the compression stroke, where it will be subjected to the burning gases during firing.

The intense heat thusfrees the dust particles of any oil or unburned fuel and leaves them in suspension in the gases, to pass' out through the exhaust.

With the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, the-description being supplemented by the accompanying` drawmg. I

Fig. 1 is a Sectional View through a portion of thev cylinder wall, an alumnum 'piston theren, and the invention applied to said piston.

Fig. 2 is an enlarged detail Sectional view.

Fig. 3 is a Sectional perspective view of a v portion of one of the rings. i

In the drawing above briefi described, the numeral 5 desgnates a cylin er wall and 6 denotes a piston therein'. This piston is of the type commonly used when aluminum is employed in the piston construction, but

The ring consists of a body portionl12 for reception in the groove 7, and -a flange' portion 13 integral with said body ortion to 'surround the reduced part 11 of t e pis-' toni`6, said flange portion being of awidth to extend entirely to the iston head 10. The outer 'or peripheral sur aces of the body and flange portions 12 and 13 may be flush Hor they may be otherwise shaped for contact with the cylinder wall 5, and the upper or free edge of said fiange portion 13 is, formed with a continuous groove 14. The bottom of this groove meets the outer and innerlsurfaces 15-16, of the fiange portion 13 at acute angles thereto, .as will .be

clear from Figs. 2 and 3. By this constructionfany accumulated matter on the cylinder Wall 5 will be removed from said wall and immediately directed toward the center' of Athe cylinder. as indicated by the arrow A in Fig. 2. This action ofcourse takes place on each com ression stroke and upon each exhaust lstro e, and the ymatter thrown toward the center of the cylinder upon the compres'sion stroke is subjected to the intense heat created by firing of the gases. This heat frees all dust and the like, leaving it in sus ension for discharge from the cylinder wit the exhaust gases.

If desired, one of the im roved rings may be used in the groove .9, as llustrated in Fig. 1` and will then serve as an 'effective oil scraper. Openings 17 may be drilled to the interor of the piston from this groove if i desired, to carry excess oil back to the crank case. In the groove 8, an ordinary ring may be em loyed. It may further be explained that i the piston skirt does not move outof 'rovided with the usual4 ica invention as claimed, slight variations may ,be made.

said bodyv rtion to surround the ert of the iston tween the groove and t episton' ead, the peripheral srfaces of said portions bein ada ted for contact with the cylinder wal an the free edge of said flange portion being formed with a contnuous groove whose bottom meets the inner and outer surfaces of said flange portion at acute angles thereto, said flange ortion and its groove serving to remove oi, unburned fuel and dust' from the cylinder wall and serving to throw them toward the center of the cylinder. v

In testimony whereof I have hereunto affixed my signature.

CHARLES g-H. LEMERY. 

